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Old 06-24-2010, 11:19 PM   #1
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Default Hyper ST Pro rear dogbones too short

I was wondering if anyone else had this problem with the Hyper ST Pro. The rear dogbones or universal drive shafts (part # 86217) are too short on my truggy. The right side rear dogbone is just falling out of the diff cup at idle on the bench. The left side rear dogbone stays in the diff cup but it is riding on the outer edge. I called OFNA technical support and they said the dogbone should measure 127mm from pin to pin on the dogbone. Keep in mind you need to measure from the outside of the pins on the dogbones. My dogbones measure 126mm. It seems to me that even at 127mm they would still be 1mm too short. How do the rear dogbones sit for everyone else with a Hyper ST Pro?

OFNA will not honor warranties for items purchased off of Ebay so I cannot get new dogbones under warranty from OFNA. What I would like to do is have some custom made so I know they will be the correct length since I now have trust issues with OFNA. If anyone knows who can make custom dogbones can you please let me know?
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Old 06-24-2010, 11:43 PM   #2
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Ask someone else who owns this truggy to measure the ones they have and compare. I had a Hyper ST pro and had no problems with the rear bones. It is possible that you have the wrong size
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Old 06-24-2010, 11:46 PM   #3
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I had the same issue also, its hard to remember 100% but Replace ur rear arms. Ofna made the rear arms retarded, they break at the end of the arm and u can totally miss it. I use to glue them back because the arm always broke in the same spot after a good day of driving. I loved that car but I do remember having that issue alot and I think it got so bad I had to safety wire it together so the arm wouldn't keep breaking. Kist take ur complete arm off and look at the end (outside where hub goes) where it has a thin bar, it's probly got a this crack and it's flexing letting the hub move enough fir this problem to keep happening. It's a problem with those cars.
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Old 06-25-2010, 03:11 AM   #4
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Im beleave that the front dogbones are a little shorter than the rear I have the same problem when I first put mine together just switch the front and rears with each other.
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Old 06-25-2010, 07:48 AM   #5
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I raced a Hyper ST Pro for almost 2 years without any dogbone issues or any other problems. The Hyper ST Pro is a beast
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Old 06-25-2010, 11:20 AM   #6
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Sounds like you have the front universals in the rear. Switch them around and let us know....
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Old 06-25-2010, 09:54 PM   #7
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Quote:
Originally Posted by CKmaxx View Post
Sounds like you have the front universals in the rear. Switch them around and let us know....
Nope they are installed correctly. The front axles are actually longer at 129mm and thinner in width. The rear axles are shorter and thicker and supposed to be 127mm in length.
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Hyper ST Pro rear dogbones too short-dogbone.jpg   Hyper ST Pro rear dogbones too short-dogbone1-2-.jpg   Hyper ST Pro rear dogbones too short-dogbone1-3-.jpg  
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Old 06-25-2010, 10:03 PM   #8
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try switching them..how far into the outdrive cups are the front ones?
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Old 06-25-2010, 10:08 PM   #9
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Quote:
Originally Posted by Jaz240 View Post
try switching them..how far into the outdrive cups are the front ones?
The front cvd's will work in the back. But because the front axles are thinner I was worried about them bending. But the rear axles are wayyy to short for the front. You get a negative camber (top of tire leans in) that you can't adjust out.
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Old 06-26-2010, 08:18 AM   #10
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hello!
I use a ST pro and i see the same , but never have problems put a silicon orring into boot saffts and quit the loose safft
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Old 06-26-2010, 09:55 AM   #11
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Check that your droop is set right. I ran 2 Hyper ST's for a while and never had a problem with the cvd's or rear arms breaking.
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Old 06-26-2010, 10:06 AM   #12
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Just throwing this out there: is there any way by chance you put the rear A arms in the front?
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Old 06-26-2010, 04:16 PM   #13
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Quote:
Originally Posted by Jaz240 View Post
Just throwing this out there: is there any way by chance you put the rear A arms in the front?
The A-arms are installed correctly.
I did find a part number difference. Ofna shows the rear universal driveshafts as OFN27217. Which explains why I could not find the rear universals. I was searching for the Hobao part number listed from the manual as 86217. !@#$#!@#$!!!!

Has anyone found an aftermarket solution for Hyper ST universal driveshafts?
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Old 06-30-2010, 06:10 PM   #14
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Default Vindication

The new universals came in today. Not cheap at $45.00 on sale. But look at the 19mm difference between the new longer universals in the comparison photo.

But this means aslo means the Ofna tech didn't know what he was talking about because the said the shaft was supposed to be 127mm in length. When in actuallity is was 145mm. My original shafts were only 126mm long. So that is the 19mm difference I was talking about above. The 3rd picture is how they told me to take the measurements.

The 2nd picture shows the dogbone is now sitting as it should in the diff cup.
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Hyper ST Pro rear dogbones too short-compare-1-.jpg   Hyper ST Pro rear dogbones too short-correct.jpg   Hyper ST Pro rear dogbones too short-measure.jpg  
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